Charging control circuit, method and electronic device thereof

Abstract

The present invention discloses a charging control circuit, comprising an external power source, a switching circuit, and a charging path circuit comprising a first output circuit and a second output circuit, wherein the external power source is configured to charge a secondary battery through the first output circuit and charge a load through the second output circuit, and the switching circuit is configured to decouple the secondary battery from the load when the external power source is available. Meanwhile, the present invention discloses a charging control method and an electronic device; according to the present invention, because the two output circuits are coupled to the secondary battery and the load, respectively, the load will not divide up the charging current, thereby effectively shortening the charging time and prolonging the service life of the secondary battery.

What is claimed is: 
     
         1 . A charging control circuit, comprising:
 an external power source, a switch circuit, and a charging path circuit comprising a first output circuit and a second output circuit; wherein:   the external power source is configured to charge a secondary battery through the first output circuit and supply power to a load through the second output circuit; and   the switch circuit is configured to decouple the secondary battery from the load when the external power source is available.   
     
     
         2 . The circuit according to  claim 1 , wherein the first output circuit is configured to convert a DC voltage provided by the external power source to a DC voltage adaptive for charging the secondary battery, and to output the converted DC voltage to the secondary battery to charge the secondary battery; and
 the second output circuit is configured to convert the DC voltage provided by the external power source to a DC voltage adaptive for powering the load, and to output the converted DC voltage to the load to supply power to the load.   
     
     
         3 . The circuit according to  claim 1 , wherein the charging path circuit further comprises a buck circuit;
 wherein the buck circuit is configured to convert the DC voltage provided by the external power source to a DC voltage lower than the provided DC voltage;   correspondingly, the first output circuit is configured to convert a DC voltage output by the buck circuit to a DC voltage adaptive for charging the secondary battery, and to output the converted DC voltage to the secondary battery to charge the secondary battery; and   the second output circuit is configured to convert the DC voltage output by the buck circuit to a DC voltage adaptive for powering the load, and to output the converted DC voltage to the load to supply power to the load.   
     
     
         4 . The circuit according to  claim 3 , wherein the charging path circuit further comprises a charging path control circuit, configured to control the buck circuit, the first output circuit and the second output circuit to enable the external power source to charge the secondary battery through the buck circuit and the first output circuit, and enable the external power source to supply power to the load through the buck circuit and the second output circuit. 
     
     
         5 . The circuit according to  claim 3 , wherein the charging path further comprises: a filter circuit, configured to filter out ripples from output voltages of the first output circuit and the second output circuit. 
     
     
         6 . The circuit according to  claim 1 , wherein the switch circuit is further configured to couple the secondary battery to the load when the external power source is not available; and
 the secondary battery is configured to supply power to the load.   
     
     
         7 . The circuit according to  claim 1 , wherein the secondary battery is a lithium battery. 
     
     
         8 . The circuit according to  claim 1 , wherein the load is a power management integrated circuit (PMIC). 
     
     
         9 . A charging control method, comprising:
 when an external power source is available,
 decoupling a secondary battery from a load; 
 charging, by the external power source, the secondary battery through a first output circuit of a charging path circuit; and 
 supplying power, by the external power source, to the load through a second output circuit of the charging path circuit. 
   
     
     
         10 . The method according to  claim 9 , wherein the charging comprises:
 converting a DC voltage provided by the external power source to a DC voltage adaptive for charging the secondary battery through the first output circuit to charge the secondary battery; and   correspondingly, the supplying comprises:   converting a DC voltage provided by the external power source to a DC voltage adaptive for powering the load through the second output circuit to supply power to the load.   
     
     
         11 . The method according to  claim 9 , wherein the charging comprises:
 converting, by the charging path circuit, the DC voltage provided by the external power source to a DC voltage lower than the provided DC voltage; and   converting the converted DC voltage that is lower than the provided DC voltage to a DC voltage adaptive for charging the secondary battery through the first output circuit to charge the secondary battery;   correspondingly, the supplying comprises:   converting the converted DC voltage that is lower than the provided DC voltage to a DC voltage adaptive for powering the load through the second output circuit to supply power to the load.   
     
     
         12 . The method according to  claim 11 , further comprising:
 filtering out ripples from the output voltages of the first output circuit and the second output circuit.   
     
     
         13 . The method according to  claim 9 , further comprising:
 when the external power source is not available,
 coupling the secondary battery to the load, and 
 supplying power to the load by the secondary battery. 
   
     
     
         14 . An electronic device, comprising a mainboard, a shell and a charging control circuit, wherein the charging control circuit comprises an external power source, a switch circuit, and a charging path circuit comprising a first output circuit and a second output circuit; wherein:
 the external power source is configured to charge a secondary battery through the first output circuit, and to supply power to a load through the second output circuit; and   the switch circuit is configured to decouple the secondary battery from the load when the external power source is available.   
     
     
         15 . The circuit according to  claim 14 , wherein the first output circuit is configured to convert a DC voltage provided by the external power source to a DC voltage adaptive for charging the secondary battery, and to output the converted DC voltage to the secondary battery to charge the secondary battery; and
 the second output circuit is configured to convert the DC voltage provided by the external power source to a DC voltage adaptive for powering the load, and to output the converted DC voltage to the load to supply power to the load.   
     
     
         16 . The circuit according to  claim 14 , wherein the charging path circuit further comprises a buck circuit;
 wherein the buck circuit is configured to convert the DC voltage provided by the external power source to a DC voltage lower than the provided DC voltage;   correspondingly, the first output circuit is configured to convert a DC voltage output by the buck circuit to a DC voltage adaptive for charging the secondary battery, and output the converted DC voltage to the secondary battery to charge the secondary battery; and   the second output circuit is configured to convert the DC voltage output by the buck circuit to a DC voltage adaptive for powering the load, and output the converted DC voltage to the load to supply power to the load.   
     
     
         17 . The circuit according to  claim 16 , wherein the charging path circuit further comprises a charging path control circuit, configured to control the buck circuit, the first output circuit and the second output circuit to enable the external power source to charge the secondary battery through the buck circuit and the first output circuit, in turn, and enable the external power source to supply power to the load through the buck circuit and the second output circuit, in turn. 
     
     
         18 . The electronic device according to  claim 16 , wherein the charging path further comprises: a filter circuit, configured to filter out ripples from the output voltages of the first output circuit and the second output circuit. 
     
     
         19 . The circuit according to  claim 14 , wherein the switch circuit is further configured to couple the secondary battery to the load when the external power source is not available;
 the secondary battery is configured to supply power to the load.   
     
     
         20 . The electronic device according to  claim 14 , wherein the secondary battery is a lithium battery. 
     
     
         21 . The electronic device according to  claim 14 , wherein the load is a power management integrated circuit (PMIC).